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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab8fa7a29489ee13749f71ea1bc32a7e1a3e03159a98ef7977d2fafb7ab6e430' 
  AND token = 'qxKKaKloZVV2OO08sRij4G2u5EGZzt8T3tBDXmYNiz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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