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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e70bef2fd1141166b88d9782e885eba5a21cdf675396cff9ccf5f9650e531ce0' 
  AND token = '8Vpv0defyCqBpsHJcLxwuD9H0LppQuEirX7fbkqMOuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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