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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f75c6e3f671ad1baaca0864d34c6808b21887b23a1937abc02af4432ae964d13' 
  AND token = 'npYMbQVXjChvSXjJPh+6roJJ2s3xH3jp+0UHjhkrr2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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