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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1ccd06f295d1a05d5c649d35f79f15c65e60e52e0920e3f79fbe04c2b53f9e6' 
  AND token = 'd2wDHeBwkppWJRpglftVyzWHEJ7RMhoBa24q91K6MHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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