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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba073db815d6f8c61ada78827965cb2eb1b35b1779fe4566440a5ae4755e86c5' 
  AND token = 'RewzZr/cbq5yLkwyfZHy6ErBZ60YFEO/6jzWInsxCfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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