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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5c708cb5782bde0ffa9aea2d0ffd1087297b84da54925b6fefd6ce3f06c0470' 
  AND token = '/70ELR9mu0mW2AIp08BTaE0rwRFDJhmYAycsoW6Aa/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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