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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bffefdf29b2fda29be57e0be4fcdba7eeabc34434361698f37e7b5fc6b01c014' 
  AND token = 'z9DP05ogloiSwGlc9lJM7kr07zOlQ4j9Ih/ZYGvR1n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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