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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8d3921e09a57813342871d88cc75ce0315fd89b55dabe8e3c19dd233c93fc59' 
  AND token = 'sAVn1Q8780s1EVEI28+mj4N57OStuPgGIsGKw/OVlnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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