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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d6d67cc359151bb6badc57e35fee9d9fe0b745c02e9ceda781863b0b899b034' 
  AND token = 'vuBh6chOIwozb9RWtinISOuMIQvGj5+hksToGKg5P1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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