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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3687d977ffeaf94395590521f6efc907459ae9ed06a8a9de36e6727e1b26537a' 
  AND token = '7kZt/NZ7mdp6eXUV97UiGUB9X9Ga3CfxphHuo+fFdMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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