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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '711317b3b8871c7cbd7e0254a3081f2ef4577d35b791883db3e8bc4d18e54d0a' 
  AND token = 'xb2xPjNDBVeTQq2lMnvi/jNnnI3VelFXoFljay5+1k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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