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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1869b0e8c9710ec800234cf2d756d085e9d5ee62b22e87c54242db9d36b520a7' 
  AND token = 'oduAJg4S0kMTSpW5pNE86JIlkZmMJ2SV8RWheprF+8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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