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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26113d6b607891e25eef684f260e6a5d671942371a3be3a11654aa2c8069dcc5' 
  AND token = '96d5AkkPMRpJpPncSVzpMLR5s62cL/5iQj9kTNWXbiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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