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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c09e34da313e4611feb25e690fb27ce66b331fa699143aaa1829f968fd41d009' 
  AND token = 'Rm8Spr1dkGwTLvEkVEJu1bRyGaP66d/xqD9JjB4Y7T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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