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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f9e07c4e2a0de53b84342129a0961fa671782ca137971c2abccb1e0bb12ecc3' 
  AND token = '5Er8hGBCTdkMG9t0CLf2qsCEhGJ3hdwG09xEVmLdpQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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