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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55c464f57a5e129e5e315f6f246cd9fa4936a60e1f6cea117f2b422b6b00a620' 
  AND token = '6aBYiCrgjKPzzPggT8wZ/MddkJHbvPraFhRkWeae1SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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