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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92e148e1bbbd66c75aa347ee5645503a68d8c2326a05c3d2cf072a3e1f6b8540' 
  AND token = 'NMqS7Uq5l3hgX1kdCJxxMMzZ4LI5jy6vroNMf5//KIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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