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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc51c50b62f3b569ecb5e8991d4df974b9cd0096ec6e4c3fed39828a88a683a1' 
  AND token = 'BoIaZfSupq8PN5gZmEOGGXVLeMrWunxuJISvYG66SoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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