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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '840477eab414935ea10ad596cc85ddf165d87da71aea4d399ea5e4de2e714547' 
  AND token = '8vSPZyI2+2c7rc11vV81h4IcvRLQDE9a0k+rskkvSLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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