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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3a1c2655afd3ede49e08ba68df04c601ee5ae6f6eea60da9a7f82fa627ade47' 
  AND token = '3o/rvddQ1u6/GUy1B/GUW7i8lAvptRY8DbI4z2UKUto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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