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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3feaefeec03c6ae6a7b0b19cd19b4d0e1f38984e1e3f046ad475cb43f2b92670' 
  AND token = 'WswQvzOx5Spg6OWDsFYowwDSePpr9pyVQcrY3mfW8v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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