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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a038bf56411fb8a2186b4c0fc344b04d9bf16f43c140e09c489ce3c900306f7' 
  AND token = 'iYWWoe/fOB4SRuzRvVxaoIcGjYRQKEL/Pdl8Kr0Kdb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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