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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4b02adab6b4f7fc208685a946bd3483fb457e6615751a8842e350bbf0d2fbc6' 
  AND token = 'CadsTO6ZiIFWI6ymWilgE07Q7JGlGmJn7MhV06U1rGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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