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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecb892896ef3aa79d480e389651553aa386c77df60155e0ad6e8cbfe63fa0678' 
  AND token = '130dvx0FPBuateqdfd5fdd0rYDiKfZJyvAZU1duquGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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