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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62a0472e3008c0e6b1d88cdbbebdb74755b21963f6d1ba4af23aaa8ada438d87' 
  AND token = 'DuSKPu8oaAjVVA+CG3Nluv8S86D6EPJFU89aiA00vBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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