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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd061471d16dbca28fe09e93e7cb2bcac56fd9c01bc9a5785a34cb78078f48e0a' 
  AND token = '/rxfs6sUKbNTf4ZohbpzLV8Iw/wv8zEHENIup8XxCOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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