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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25e21489e62efbfba4f36f865cd2e20f7fbd98b0d518e7eb43bce42f3b5fad2c' 
  AND token = 'PSfMwPp9TIH4zoFe1gASl0lwPprQoYwobH29el8WBv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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