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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b983a60349b6081c377ed7c38d32bd92bf1298e0507dfb5d5893b92fe464bf15' 
  AND token = '0wYbZlCRMAECMV0In8RCgIvvapVdGesOItmG6pA9M6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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