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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e30d4063761f03144bdf0aae71317b8e666bea3f29cf4698c1d5d61a63516bb' 
  AND token = 'b3m8czO4nyaZ5ccEelP8j1c6fr4pXwYLOj8cXZv6FVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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