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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3153a7b70f0ed36b7affa8d77655f37e5facaf491a2456a6bac2fc9b5919b7fc' 
  AND token = 'RZPfwEZqDAq5GHr4Agh5ADLlKVLSDn0FsBcddpfSENE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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