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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7e2e80d050867ac4f0a9b535eb01f80a3de57f3fe549e19eba8ce5bb9ec973e' 
  AND token = 'R2uFFJ0GHy8gKf3Ut1uAe7dp/BeRpFWi85fkAf1VQ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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