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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '707c13f7adc12e5c3acc8cd6a547236eea03b20298079badeeef3c3968dbb550' 
  AND token = 'LbUqb+xnfxA4jPzr6fu8qw1a6tAOuEi2cgz/kMtvL7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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