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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eba7952228654aa43ce4826248b66866632e4cf111e7eee0afa025c60b15a3f1' 
  AND token = 'i4wnxCnz4YGrU0SHCX4JQb6EhTAat1qf6J1AYlCatH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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