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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e86b5ce41e2eec57c06647f3b5d2fd281e4075597b420b829a84c06e92e3fd83' 
  AND token = '3IfFmRY13YjvkaVkBa9y+LBNabLuIe26Sj+HuiBkV5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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