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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8116fd8512da4dc9eb61de12c8218796a2c86da67c1a2578f6e84cf984e5620f' 
  AND token = 'r19KHDyPYQJlPB65bgPj4CBjq2X1hGiTeFz3I1yW2Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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