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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aa27dcd65f2b3bb5dd43b0ec91d04c1c8a32a524257c18b03ff0aa9a8db80fa' 
  AND token = 'lgH1wfBjddXEIR14g5D1cpR1Q9eKX9bpebMCzrjL+Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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