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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a51eb3b520cf89ba6b6f3a53bb69271448e3c0a60d1d3453de7e5c83fe71130' 
  AND token = 'FNPLU1S0Kb0nWSbTpOkkqAW9JV77Ldj5cCamMfUN0R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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