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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a7c2dfd613aa4a993b97a30118459eb4c4a9537741025d39eb152e3ffecfb9a' 
  AND token = 'fU/2iz59bL03Cp1kiUhA+mb+RPMWDWcoPC+VcV63vo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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