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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b658e9ec3181738baeaebe7d6bf1891b6c3b92656c60d4eb367d86848ee25bc' 
  AND token = '97VKGsqrpndqdx8Ik0aP2k39W49IVpv+8IK76aJ/PiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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