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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '095905e269603c86ed8a797e129fdd2cdac2bbf8fed3f0c97ae95a0b43098b0c' 
  AND token = 'Ml24QYpc+s1zx6tbfXFSo+NL6b2jIifNtNkEb8j5NPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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