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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6a544da3d8e9d8f13c439c256f5182f5f28278c82d907160ec1154c90caf379' 
  AND token = 'YbR5y4jEd/mX6J1NF6o0hrqa6x107qWI1sgK9cR8JQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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