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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b20f0c59bc8be166f7add143c0444f06f90e4c828f0121e5275697165118098e' 
  AND token = 'Sia6cOp6Vh5xVtEQavuBS16klY0q021SGkFCN5J1ARI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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