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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '715572a317184bfa10c59d464f3ab519a9ddb629b267bafbaea53265e18c21a4' 
  AND token = 't/+TSX6SFZW05rT3D1PPS8iunVa9gaIt+Qga0mNPch4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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