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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '061c8684582e74a6fe18fe9d9634631c162422f84985c5a39ca5234f377977e1' 
  AND token = 'jxEX1rwxhQEPGWcUuGRLyw7xmzgkkz88xerlO1dRV/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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