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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b530ffdfedb27e2b049c4634847f5e1940c418ec7b4319687f41825682aee61' 
  AND token = '75oEMBmV24tAxbnqA099ID1LopjCgwru3n1uWqfVDLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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