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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2e09c11ab3f66f43f2d0fa490ca7f47a85bf710514c4067d130e55fde0b415b' 
  AND token = 'dyJ9h7yn2xbR/6JIRbvisR3zUe82Vd1qGWRcXiqg+bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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