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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '480b883f446360f8a612f1e0c16865080d4fe6a6d7960c8cccc44521f2daa691' 
  AND token = 'MCr7Ktb9N+/aeGO3ozU08c9j6ZIBf3k0fIoea3HD62k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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