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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e602b24b93aaab87ebfc572ad882e14fdf57e9de217839e09f3dfb46344ed0b' 
  AND token = 'wnC+bc4/2RRntRkHpLOYYU96GnxYWtKHDCdHn6iw7FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}