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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b79ee19618b47ef07b30359a8d8030d9c1acaa9e2b1f13864b26e8128ca1d50a' 
  AND token = 'DPthBzGqa+mHydLM1DcRIR3lH3gvWkT+m87WC78RGwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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